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<title>class Gem::Package::TarHeader - rubygems: Ruby Standard Library Documentation</title>


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    <li ><a href="#method-c-new">::new</a>
    <li ><a href="#method-c-oct_or_256based">::oct_or_256based</a>
    <li ><a href="#method-c-strict_oct">::strict_oct</a>
    <li ><a href="#method-i-calculate_checksum">#calculate_checksum</a>
    <li ><a href="#method-i-empty-3F">#empty?</a>
    <li ><a href="#method-i-header">#header</a>
    <li ><a href="#method-i-oct">#oct</a>
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    <main role="main" aria-labelledby="class-Gem::Package::TarHeader">
    <h1 id="class-Gem::Package::TarHeader" class="class">
      class Gem::Package::TarHeader
    </h1>

    <section class="description">
    
<p>A header for a tar file</p>

    </section>

      <section id="5Buntitled-5D" class="documentation-section">


      <section class="constants-list">
      <header>
      <h3>Constants</h3>
      </header>
      <dl>
          <dt id="FIELDS">FIELDS
          <dd><p>Fields in the tar header</p>
          <dt id="PACK_FORMAT">PACK_FORMAT
          <dd><p>Pack format for a tar header</p>
          <dt id="UNPACK_FORMAT">UNPACK_FORMAT
          <dd><p>Unpack format for a tar header</p>
        </dl>
        </section>



                <section id="public-class-5Buntitled-5D-method-details" class="method-section">
                <header>
                <h3>Public Class Methods</h3>
                </header>

                  <div id="method-c-from" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">from</span><span
                                class="method-args">(stream)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Creates a tar header from IO <code>stream</code></p>

                              <div class="method-source-code" id="from-source">
            <pre><span class="ruby-comment"># File rubygems/package/tar_header.rb, line 103</span>
<span class="ruby-keyword">def</span> <span class="ruby-keyword">self</span>.<span class="ruby-identifier ruby-title">from</span>(<span class="ruby-identifier">stream</span>)
  <span class="ruby-identifier">header</span> = <span class="ruby-identifier">stream</span>.<span class="ruby-identifier">read</span> <span class="ruby-value">512</span>
  <span class="ruby-identifier">empty</span> = (<span class="ruby-identifier">header</span> <span class="ruby-operator">==</span> <span class="ruby-constant">EMPTY_HEADER</span>)

  <span class="ruby-identifier">fields</span> = <span class="ruby-identifier">header</span>.<span class="ruby-identifier">unpack</span> <span class="ruby-constant">UNPACK_FORMAT</span>

  <span class="ruby-identifier">new</span> <span class="ruby-value">:name</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-identifier">fields</span>.<span class="ruby-identifier">shift</span>,
      <span class="ruby-value">:mode</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-identifier">strict_oct</span>(<span class="ruby-identifier">fields</span>.<span class="ruby-identifier">shift</span>),
      <span class="ruby-value">:uid</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-identifier">oct_or_256based</span>(<span class="ruby-identifier">fields</span>.<span class="ruby-identifier">shift</span>),
      <span class="ruby-value">:gid</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-identifier">oct_or_256based</span>(<span class="ruby-identifier">fields</span>.<span class="ruby-identifier">shift</span>),
      <span class="ruby-value">:size</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-identifier">strict_oct</span>(<span class="ruby-identifier">fields</span>.<span class="ruby-identifier">shift</span>),
      <span class="ruby-value">:mtime</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-identifier">strict_oct</span>(<span class="ruby-identifier">fields</span>.<span class="ruby-identifier">shift</span>),
      <span class="ruby-value">:checksum</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-identifier">strict_oct</span>(<span class="ruby-identifier">fields</span>.<span class="ruby-identifier">shift</span>),
      <span class="ruby-value">:typeflag</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-identifier">fields</span>.<span class="ruby-identifier">shift</span>,
      <span class="ruby-value">:linkname</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-identifier">fields</span>.<span class="ruby-identifier">shift</span>,
      <span class="ruby-value">:magic</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-identifier">fields</span>.<span class="ruby-identifier">shift</span>,
      <span class="ruby-value">:version</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-identifier">strict_oct</span>(<span class="ruby-identifier">fields</span>.<span class="ruby-identifier">shift</span>),
      <span class="ruby-value">:uname</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-identifier">fields</span>.<span class="ruby-identifier">shift</span>,
      <span class="ruby-value">:gname</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-identifier">fields</span>.<span class="ruby-identifier">shift</span>,
      <span class="ruby-value">:devmajor</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-identifier">strict_oct</span>(<span class="ruby-identifier">fields</span>.<span class="ruby-identifier">shift</span>),
      <span class="ruby-value">:devminor</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-identifier">strict_oct</span>(<span class="ruby-identifier">fields</span>.<span class="ruby-identifier">shift</span>),
      <span class="ruby-value">:prefix</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-identifier">fields</span>.<span class="ruby-identifier">shift</span>,

      <span class="ruby-value">:empty</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-identifier">empty</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-c-new" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">new</span><span
                                class="method-args">(vals)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Creates a new <a href="TarHeader.html"><code>TarHeader</code></a> using <code>vals</code></p>

                              <div class="method-source-code" id="new-source">
            <pre><span class="ruby-comment"># File rubygems/package/tar_header.rb, line 147</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">initialize</span>(<span class="ruby-identifier">vals</span>)
  <span class="ruby-keyword">unless</span> <span class="ruby-identifier">vals</span>[<span class="ruby-value">:name</span>] <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-identifier">vals</span>[<span class="ruby-value">:size</span>] <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-identifier">vals</span>[<span class="ruby-value">:prefix</span>] <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-identifier">vals</span>[<span class="ruby-value">:mode</span>]
    <span class="ruby-identifier">raise</span> <span class="ruby-constant">ArgumentError</span>, <span class="ruby-string">&quot;:name, :size, :prefix and :mode required&quot;</span>
  <span class="ruby-keyword">end</span>

  <span class="ruby-identifier">vals</span>[<span class="ruby-value">:uid</span>] <span class="ruby-operator">||=</span> <span class="ruby-value">0</span>
  <span class="ruby-identifier">vals</span>[<span class="ruby-value">:gid</span>] <span class="ruby-operator">||=</span> <span class="ruby-value">0</span>
  <span class="ruby-identifier">vals</span>[<span class="ruby-value">:mtime</span>] <span class="ruby-operator">||=</span> <span class="ruby-value">0</span>
  <span class="ruby-identifier">vals</span>[<span class="ruby-value">:checksum</span>] <span class="ruby-operator">||=</span> <span class="ruby-string">&quot;&quot;</span>
  <span class="ruby-identifier">vals</span>[<span class="ruby-value">:typeflag</span>] = <span class="ruby-string">&quot;0&quot;</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">vals</span>[<span class="ruby-value">:typeflag</span>].<span class="ruby-identifier">nil?</span> <span class="ruby-operator">||</span> <span class="ruby-identifier">vals</span>[<span class="ruby-value">:typeflag</span>].<span class="ruby-identifier">empty?</span>
  <span class="ruby-identifier">vals</span>[<span class="ruby-value">:magic</span>] <span class="ruby-operator">||=</span> <span class="ruby-string">&quot;ustar&quot;</span>
  <span class="ruby-identifier">vals</span>[<span class="ruby-value">:version</span>] <span class="ruby-operator">||=</span> <span class="ruby-string">&quot;00&quot;</span>
  <span class="ruby-identifier">vals</span>[<span class="ruby-value">:uname</span>] <span class="ruby-operator">||=</span> <span class="ruby-string">&quot;wheel&quot;</span>
  <span class="ruby-identifier">vals</span>[<span class="ruby-value">:gname</span>] <span class="ruby-operator">||=</span> <span class="ruby-string">&quot;wheel&quot;</span>
  <span class="ruby-identifier">vals</span>[<span class="ruby-value">:devmajor</span>] <span class="ruby-operator">||=</span> <span class="ruby-value">0</span>
  <span class="ruby-identifier">vals</span>[<span class="ruby-value">:devminor</span>] <span class="ruby-operator">||=</span> <span class="ruby-value">0</span>

  <span class="ruby-constant">FIELDS</span>.<span class="ruby-identifier">each</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">name</span><span class="ruby-operator">|</span>
    <span class="ruby-identifier">instance_variable_set</span> <span class="ruby-node">&quot;@#{name}&quot;</span>, <span class="ruby-identifier">vals</span>[<span class="ruby-identifier">name</span>]
  <span class="ruby-keyword">end</span>

  <span class="ruby-ivar">@empty</span> = <span class="ruby-identifier">vals</span>[<span class="ruby-value">:empty</span>]
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-c-oct_or_256based" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">oct_or_256based</span><span
                                class="method-args">(str)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="oct_or_256based-source">
            <pre><span class="ruby-comment"># File rubygems/package/tar_header.rb, line 135</span>
<span class="ruby-keyword">def</span> <span class="ruby-keyword">self</span>.<span class="ruby-identifier ruby-title">oct_or_256based</span>(<span class="ruby-identifier">str</span>)
  <span class="ruby-comment"># \x80 flags a positive 256-based number</span>
  <span class="ruby-comment"># \ff flags a negative 256-based number</span>
  <span class="ruby-comment"># In case we have a match, parse it as a signed binary value</span>
  <span class="ruby-comment"># in big-endian order, except that the high-order bit is ignored.</span>
  <span class="ruby-keyword">return</span> <span class="ruby-identifier">str</span>.<span class="ruby-identifier">unpack</span>(<span class="ruby-string">&quot;N2&quot;</span>).<span class="ruby-identifier">last</span> <span class="ruby-keyword">if</span> <span class="ruby-regexp">/\A[\x80\xff]/n</span>.<span class="ruby-identifier">match?</span>(<span class="ruby-identifier">str</span>)
  <span class="ruby-identifier">strict_oct</span>(<span class="ruby-identifier">str</span>)
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-c-strict_oct" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">strict_oct</span><span
                                class="method-args">(str)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="strict_oct-source">
            <pre><span class="ruby-comment"># File rubygems/package/tar_header.rb, line 129</span>
<span class="ruby-keyword">def</span> <span class="ruby-keyword">self</span>.<span class="ruby-identifier ruby-title">strict_oct</span>(<span class="ruby-identifier">str</span>)
  <span class="ruby-keyword">return</span> <span class="ruby-identifier">str</span>.<span class="ruby-identifier">strip</span>.<span class="ruby-identifier">oct</span> <span class="ruby-keyword">if</span> <span class="ruby-regexp">/\A[0-7]*\z/</span>.<span class="ruby-identifier">match?</span>(<span class="ruby-identifier">str</span>.<span class="ruby-identifier">strip</span>)

  <span class="ruby-identifier">raise</span> <span class="ruby-constant">ArgumentError</span>, <span class="ruby-node">&quot;#{str.inspect} is not an octal string&quot;</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                          </section>

                <section id="public-instance-5Buntitled-5D-method-details" class="method-section">
                <header>
                <h3>Public Instance Methods</h3>
                </header>

                  <div id="method-i-empty-3F" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">empty?</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Is the tar entry empty?</p>

                              <div class="method-source-code" id="empty-3F-source">
            <pre><span class="ruby-comment"># File rubygems/package/tar_header.rb, line 174</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">empty?</span>
  <span class="ruby-ivar">@empty</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-update_checksum" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">update_checksum</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Updates the TarHeader’s checksum</p>

                              <div class="method-source-code" id="update_checksum-source">
            <pre><span class="ruby-comment"># File rubygems/package/tar_header.rb, line 206</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">update_checksum</span>
  <span class="ruby-identifier">header</span> = <span class="ruby-identifier">header</span> <span class="ruby-string">&quot; &quot;</span> <span class="ruby-operator">*</span> <span class="ruby-value">8</span>
  <span class="ruby-ivar">@checksum</span> = <span class="ruby-identifier">oct</span> <span class="ruby-identifier">calculate_checksum</span>(<span class="ruby-identifier">header</span>), <span class="ruby-value">6</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                          </section>

                <section id="private-instance-5Buntitled-5D-method-details" class="method-section">
                <header>
                <h3>Private Instance Methods</h3>
                </header>

                  <div id="method-i-calculate_checksum" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">calculate_checksum</span><span
                                class="method-args">(header)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="calculate_checksum-source">
            <pre><span class="ruby-comment"># File rubygems/package/tar_header.rb, line 213</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">calculate_checksum</span>(<span class="ruby-identifier">header</span>)
  <span class="ruby-identifier">header</span>.<span class="ruby-identifier">sum</span>(<span class="ruby-value">0</span>)
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-header" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">header</span><span
                                class="method-args">(checksum = @checksum)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="header-source">
            <pre><span class="ruby-comment"># File rubygems/package/tar_header.rb, line 217</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">header</span>(<span class="ruby-identifier">checksum</span> = <span class="ruby-ivar">@checksum</span>)
  <span class="ruby-identifier">header</span> = [
    <span class="ruby-identifier">name</span>,
    <span class="ruby-identifier">oct</span>(<span class="ruby-identifier">mode</span>, <span class="ruby-value">7</span>),
    <span class="ruby-identifier">oct</span>(<span class="ruby-identifier">uid</span>, <span class="ruby-value">7</span>),
    <span class="ruby-identifier">oct</span>(<span class="ruby-identifier">gid</span>, <span class="ruby-value">7</span>),
    <span class="ruby-identifier">oct</span>(<span class="ruby-identifier">size</span>, <span class="ruby-value">11</span>),
    <span class="ruby-identifier">oct</span>(<span class="ruby-identifier">mtime</span>, <span class="ruby-value">11</span>),
    <span class="ruby-identifier">checksum</span>,
    <span class="ruby-string">&quot; &quot;</span>,
    <span class="ruby-identifier">typeflag</span>,
    <span class="ruby-identifier">linkname</span>,
    <span class="ruby-identifier">magic</span>,
    <span class="ruby-identifier">oct</span>(<span class="ruby-identifier">version</span>, <span class="ruby-value">2</span>),
    <span class="ruby-identifier">uname</span>,
    <span class="ruby-identifier">gname</span>,
    <span class="ruby-identifier">oct</span>(<span class="ruby-identifier">devmajor</span>, <span class="ruby-value">7</span>),
    <span class="ruby-identifier">oct</span>(<span class="ruby-identifier">devminor</span>, <span class="ruby-value">7</span>),
    <span class="ruby-identifier">prefix</span>,
  ]

  <span class="ruby-identifier">header</span> = <span class="ruby-identifier">header</span>.<span class="ruby-identifier">pack</span> <span class="ruby-constant">PACK_FORMAT</span>

  <span class="ruby-identifier">header</span> <span class="ruby-operator">&lt;&lt;</span> (<span class="ruby-string">&quot;\0&quot;</span> <span class="ruby-operator">*</span> ((<span class="ruby-value">512</span> <span class="ruby-operator">-</span> <span class="ruby-identifier">header</span>.<span class="ruby-identifier">size</span>) <span class="ruby-operator">%</span> <span class="ruby-value">512</span>))
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-oct" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">oct</span><span
                                class="method-args">(num, len)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="oct-source">
            <pre><span class="ruby-comment"># File rubygems/package/tar_header.rb, line 243</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">oct</span>(<span class="ruby-identifier">num</span>, <span class="ruby-identifier">len</span>)
  <span class="ruby-identifier">format</span>(<span class="ruby-node">&quot;%0#{len}o&quot;</span>, <span class="ruby-identifier">num</span>)
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

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<script type="text/javascript">


  let ads  = $("#carbonads-container").children().detach();


  function swapMode() {
    var cookieName = 'darkmode';
    var cssDarkmode = Cookies.get(cookieName);
    console.log("***** swapMode! " + cssDarkmode + " *****");


    if (cssDarkmode == "true") {
      console.log("We have dark mode, set the css to light ...");
      $('#rdoccss').attr("href", defaultModeCssHref);
      $('#cssSelect').text("Dark mode");
      cssDarkmode = "false";
      console.log("swapMode! Now set cookie to " + cssDarkmode);
      Cookies.set(cookieName, cssDarkmode);

    } else {
      console.log("We not have dark mode, set the css to dark ...");
      $('#rdoccss').attr("href", darkModeCsseHref);
      $('#cssSelect').text("Light mode");
      cssDarkmode = "true";
      console.log("swapMode! Now set cookie to " + cssDarkmode);
      Cookies.set(cookieName, cssDarkmode);

    }

    console.log("  --------------- ");
  }


const vueCssApp = new Vue({
el: '#menubar',
data: {
isDark: false
},
methods: {
toggleClass: function(event){
this.isDark = !this.isDark;
}
}
})

const vueApp = new Vue({
el: '#vapp',
data: { 
isOpen: true
},

mounted() {
this.handleResize();
this.manage_mob_classes();
window.addEventListener('resize', this.handleResize)
//this.isOpen !=  (/Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent));
},
destroyed() {
window.removeEventListener('resize', this.handleResize)
},
created() {
//manage_mob_classes();
},

methods : {
isMobile() {
  return (/Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent));
},

  handleResize() {
    if (!this.isMobile()) {
      this.isOpen = window.innerWidth > 800;
    }
  },

  manage_mob_classes() {
    if (/Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent)) {
      $("nav").addClass("mob_nav");
      $("main").addClass("mob_main");
      $("#extraz").addClass("mob_extraz");
      $("#carbonads-container").addClass("mob_carbonads-container");
      this.isOpen  = false;
    } else {
      $("nav").removeClass("mob_nav") 
        $("main").removeClass("mob_main");
      $("#extraz").removeClass("mob_extraz");
      $("#carbonads-container").removeClass("mob_carbonads-container");
      this.isOpen  = true;
    }
  },

  toggleNav() {
    this.isOpen =! this.isOpen ;
    // alert("Toggle nav!");
    console.log("toggleNav() click: " + this.isOpen );
  }
}
})

$("#carbonads-container").append(ads);


$(function() {

    var darkmode = Cookies.get("darkmode");
    console.log("Document ready: " + darkmode);

    if ( darkmode  == "true" ) {
      $('#cssSelect').text("Light mode");
    } else {
      $('#cssSelect').text("Dark mode");
     }

    $('body').css('display','block');
    });

</script>

    
  </body> 
</html>

